drivers/iio/light/hid-sensor-prox.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HID Sensors Driver
   4  * Copyright (c) 2014, Intel Corporation.
   5  */
   6 #include <linux/device.h>
   7 #include <linux/platform_device.h>
   8 #include <linux/module.h>
   9 #include <linux/mod_devicetable.h>
  10 #include <linux/slab.h>
  11 #include <linux/hid-sensor-hub.h>
  12 #include <linux/iio/iio.h>
  13 #include <linux/iio/buffer.h>
  14 #include "../common/hid-sensors/hid-sensor-trigger.h"
  15
  16 #define CHANNEL_SCAN_INDEX_PRESENCE 0
  17
  18 struct prox_state {
  19         struct hid_sensor_hub_callbacks callbacks;
  20         struct hid_sensor_common common_attributes;
  21         struct hid_sensor_hub_attribute_info prox_attr;
  22         u32 human_presence;
  23         int scale_pre_decml;
  24         int scale_post_decml;
  25         int scale_precision;
  26 };
  27
  28 static const u32 prox_sensitivity_addresses[] = {
  29         HID_USAGE_SENSOR_HUMAN_PRESENCE,
  30         HID_USAGE_SENSOR_DATA_PRESENCE,
  31 };
  32
  33 /* Channel definitions */
  34 static const struct iio_chan_spec prox_channels[] = {
  35         {
  36                 .type = IIO_PROXIMITY,
  37                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  38                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  39                 BIT(IIO_CHAN_INFO_SCALE) |
  40                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  41                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  42                 .scan_index = CHANNEL_SCAN_INDEX_PRESENCE,
  43         }
  44 };
  45
  46 /* Adjust channel real bits based on report descriptor */
  47 static void prox_adjust_channel_bit_mask(struct iio_chan_spec *channels,
  48                                         int channel, int size)
  49 {
  50         channels[channel].scan_type.sign = 's';
  51         /* Real storage bits will change based on the report desc. */
  52         channels[channel].scan_type.realbits = size * 8;
  53         /* Maximum size of a sample to capture is u32 */
  54         channels[channel].scan_type.storagebits = sizeof(u32) * 8;
  55 }
  56
  57 /* Channel read_raw handler */
  58 static int prox_read_raw(struct iio_dev *indio_dev,
  59                               struct iio_chan_spec const *chan,
  60                               int *val, int *val2,
  61                               long mask)
  62 {
  63         struct prox_state *prox_state = iio_priv(indio_dev);
  64         struct hid_sensor_hub_device *hsdev;
  65         int report_id = -1;
  66         u32 address;
  67         int ret_type;
  68         s32 min;
  69
  70         *val = 0;
  71         *val2 = 0;
  72         switch (mask) {
  73         case IIO_CHAN_INFO_RAW:
  74                 switch (chan->scan_index) {
  75                 case  CHANNEL_SCAN_INDEX_PRESENCE:
  76                         report_id = prox_state->prox_attr.report_id;
  77                         min = prox_state->prox_attr.logical_minimum;
  78                         address = HID_USAGE_SENSOR_HUMAN_PRESENCE;
  79                         hsdev = prox_state->common_attributes.hsdev;
  80                         break;
  81                 default:
  82                         report_id = -1;
  83                         break;
  84                 }
  85                 if (report_id >= 0) {
  86                         hid_sensor_power_state(&prox_state->common_attributes,
  87                                                 true);
  88                         *val = sensor_hub_input_attr_get_raw_value(
  89                                 hsdev, hsdev->usage, address, report_id,
  90                                 SENSOR_HUB_SYNC, min < 0);
  91                         hid_sensor_power_state(&prox_state->common_attributes,
  92                                                 false);
  93                 } else {
  94                         *val = 0;
  95                         return -EINVAL;
  96                 }
  97                 ret_type = IIO_VAL_INT;
  98                 break;
  99         case IIO_CHAN_INFO_SCALE:
 100                 *val = prox_state->scale_pre_decml;
 101                 *val2 = prox_state->scale_post_decml;
 102                 ret_type = prox_state->scale_precision;
 103                 break;
 104         case IIO_CHAN_INFO_OFFSET:
 105                 *val = hid_sensor_convert_exponent(
 106                                 prox_state->prox_attr.unit_expo);
 107                 ret_type = IIO_VAL_INT;
 108                 break;
 109         case IIO_CHAN_INFO_SAMP_FREQ:
 110                 ret_type = hid_sensor_read_samp_freq_value(
 111                                 &prox_state->common_attributes, val, val2);
 112                 break;
 113         case IIO_CHAN_INFO_HYSTERESIS:
 114                 ret_type = hid_sensor_read_raw_hyst_value(
 115                                 &prox_state->common_attributes, val, val2);
 116                 break;
 117         default:
 118                 ret_type = -EINVAL;
 119                 break;
 120         }
 121
 122         return ret_type;
 123 }
 124
 125 /* Channel write_raw handler */
 126 static int prox_write_raw(struct iio_dev *indio_dev,
 127                                struct iio_chan_spec const *chan,
 128                                int val,
 129                                int val2,
 130                                long mask)
 131 {
 132         struct prox_state *prox_state = iio_priv(indio_dev);
 133         int ret = 0;
 134
 135         switch (mask) {
 136         case IIO_CHAN_INFO_SAMP_FREQ:
 137                 ret = hid_sensor_write_samp_freq_value(
 138                                 &prox_state->common_attributes, val, val2);
 139                 break;
 140         case IIO_CHAN_INFO_HYSTERESIS:
 141                 ret = hid_sensor_write_raw_hyst_value(
 142                                 &prox_state->common_attributes, val, val2);
 143                 break;
 144         default:
 145                 ret = -EINVAL;
 146         }
 147
 148         return ret;
 149 }
 150
 151 static const struct iio_info prox_info = {
 152         .read_raw = &prox_read_raw,
 153         .write_raw = &prox_write_raw,
 154 };
 155
 156 /* Function to push data to buffer */
 157 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
 158                                         int len)
 159 {
 160         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
 161         iio_push_to_buffers(indio_dev, data);
 162 }
 163
 164 /* Callback handler to send event after all samples are received and captured */
 165 static int prox_proc_event(struct hid_sensor_hub_device *hsdev,
 166                                 unsigned usage_id,
 167                                 void *priv)
 168 {
 169         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 170         struct prox_state *prox_state = iio_priv(indio_dev);
 171
 172         dev_dbg(&indio_dev->dev, "prox_proc_event\n");
 173         if (atomic_read(&prox_state->common_attributes.data_ready))
 174                 hid_sensor_push_data(indio_dev,
 175                                 &prox_state->human_presence,
 176                                 sizeof(prox_state->human_presence));
 177
 178         return 0;
 179 }
 180
 181 /* Capture samples in local storage */
 182 static int prox_capture_sample(struct hid_sensor_hub_device *hsdev,
 183                                 unsigned usage_id,
 184                                 size_t raw_len, char *raw_data,
 185                                 void *priv)
 186 {
 187         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 188         struct prox_state *prox_state = iio_priv(indio_dev);
 189         int ret = -EINVAL;
 190
 191         switch (usage_id) {
 192         case HID_USAGE_SENSOR_HUMAN_PRESENCE:
 193                 switch (raw_len) {
 194                 case 1:
 195                         prox_state->human_presence = *(u8 *)raw_data;
 196                         return 0;
 197                 case 4:
 198                         prox_state->human_presence = *(u32 *)raw_data;
 199                         return 0;
 200                 default:
 201                         break;
 202                 }
 203                 break;
 204         }
 205
 206         return ret;
 207 }
 208
 209 /* Parse report which is specific to an usage id*/
 210 static int prox_parse_report(struct platform_device *pdev,
 211                                 struct hid_sensor_hub_device *hsdev,
 212                                 struct iio_chan_spec *channels,
 213                                 unsigned usage_id,
 214                                 struct prox_state *st)
 215 {
 216         int ret;
 217
 218         ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
 219                         usage_id,
 220                         HID_USAGE_SENSOR_HUMAN_PRESENCE,
 221                         &st->prox_attr);
 222         if (ret < 0)
 223                 return ret;
 224         prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE,
 225                                         st->prox_attr.size);
 226
 227         dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index,
 228                         st->prox_attr.report_id);
 229
 230         return ret;
 231 }
 232
 233 /* Function to initialize the processing for usage id */
 234 static int hid_prox_probe(struct platform_device *pdev)
 235 {
 236         int ret = 0;
 237         static const char *name = "prox";
 238         struct iio_dev *indio_dev;
 239         struct prox_state *prox_state;
 240         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 241
 242         indio_dev = devm_iio_device_alloc(&pdev->dev,
 243                                 sizeof(struct prox_state));
 244         if (!indio_dev)
 245                 return -ENOMEM;
 246         platform_set_drvdata(pdev, indio_dev);
 247
 248         prox_state = iio_priv(indio_dev);
 249         prox_state->common_attributes.hsdev = hsdev;
 250         prox_state->common_attributes.pdev = pdev;
 251
 252         ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage,
 253                                         &prox_state->common_attributes,
 254                                         prox_sensitivity_addresses,
 255                                         ARRAY_SIZE(prox_sensitivity_addresses));
 256         if (ret) {
 257                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 258                 return ret;
 259         }
 260
 261         indio_dev->channels = devm_kmemdup(&pdev->dev, prox_channels,
 262                                            sizeof(prox_channels), GFP_KERNEL);
 263         if (!indio_dev->channels) {
 264                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 265                 return -ENOMEM;
 266         }
 267
 268         ret = prox_parse_report(pdev, hsdev,
 269                                 (struct iio_chan_spec *)indio_dev->channels,
 270                                 hsdev->usage, prox_state);
 271         if (ret) {
 272                 dev_err(&pdev->dev, "failed to setup attributes\n");
 273                 return ret;
 274         }
 275
 276         indio_dev->num_channels = ARRAY_SIZE(prox_channels);
 277         indio_dev->info = &prox_info;
 278         indio_dev->name = name;
 279         indio_dev->modes = INDIO_DIRECT_MODE;
 280
 281         atomic_set(&prox_state->common_attributes.data_ready, 0);
 282
 283         ret = hid_sensor_setup_trigger(indio_dev, name,
 284                                 &prox_state->common_attributes);
 285         if (ret) {
 286                 dev_err(&pdev->dev, "trigger setup failed\n");
 287                 return ret;
 288         }
 289
 290         ret = iio_device_register(indio_dev);
 291         if (ret) {
 292                 dev_err(&pdev->dev, "device register failed\n");
 293                 goto error_remove_trigger;
 294         }
 295
 296         prox_state->callbacks.send_event = prox_proc_event;
 297         prox_state->callbacks.capture_sample = prox_capture_sample;
 298         prox_state->callbacks.pdev = pdev;
 299         ret = sensor_hub_register_callback(hsdev, hsdev->usage,
 300                                            &prox_state->callbacks);
 301         if (ret < 0) {
 302                 dev_err(&pdev->dev, "callback reg failed\n");
 303                 goto error_iio_unreg;
 304         }
 305
 306         return ret;
 307
 308 error_iio_unreg:
 309         iio_device_unregister(indio_dev);
 310 error_remove_trigger:
 311         hid_sensor_remove_trigger(indio_dev, &prox_state->common_attributes);
 312         return ret;
 313 }
 314
 315 /* Function to deinitialize the processing for usage id */
 316 static void hid_prox_remove(struct platform_device *pdev)
 317 {
 318         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 319         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 320         struct prox_state *prox_state = iio_priv(indio_dev);
 321
 322         sensor_hub_remove_callback(hsdev, hsdev->usage);
 323         iio_device_unregister(indio_dev);
 324         hid_sensor_remove_trigger(indio_dev, &prox_state->common_attributes);
 325 }
 326
 327 static const struct platform_device_id hid_prox_ids[] = {
 328         {
 329                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 330                 .name = "HID-SENSOR-200011",
 331         },
 332         {
 333                 /* Format: HID-SENSOR-tag-usage_id_in_hex_lowercase */
 334                 .name = "HID-SENSOR-LISS-0226",
 335         },
 336         { /* sentinel */ }
 337 };
 338 MODULE_DEVICE_TABLE(platform, hid_prox_ids);
 339
 340 static struct platform_driver hid_prox_platform_driver = {
 341         .id_table = hid_prox_ids,
 342         .driver = {
 343                 .name   = KBUILD_MODNAME,
 344                 .pm     = &hid_sensor_pm_ops,
 345         },
 346         .probe          = hid_prox_probe,
 347         .remove_new     = hid_prox_remove,
 348 };
 349 module_platform_driver(hid_prox_platform_driver);
 350
 351 MODULE_DESCRIPTION("HID Sensor Proximity");
 352 MODULE_AUTHOR("Archana Patni <[email protected]>");
 353 MODULE_LICENSE("GPL");
 354 MODULE_IMPORT_NS(IIO_HID);